Pump jack



w. G.}JENSEN.

PUMP JACK. 7 APPLICATION FILED AUG-17,1920.

Patented May 9, 1922 ATTORNEYS entree STATES arana. creme PUMP JACK.

inmost.

, Specification of Letters Patent.

Application filed August 17, 1920. Serial No. 404,230. t

T 0 all whom it may concern Be it known that 1, WILLIAM GUY J ENSEN, acitizen of the United States, and a resident of Bartlesville, in thecounty-of Washington and State of Oklahoma, have invented certain newand useful Improvements in Pump Jacks, of which the following is, aspecification.

The present invention relates to pump jacks. I

The object of the invention is to provide a pump jack which is of simpleanddurable construction, reliable in operation and easy to manufactureand install, which is adapted to the requirements ofvarious charactersof wells and which impartsa pure rectilinear motion to the polish rod ofthe pump so as to operate the rod with the minimum wear on the same andon its stufiing boxes and associated structure. 7

Other objects and advantages of the in-- vention reside in certain novelfeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described and particularly pointed out in theappended claim, reference being bad to the accompanying" drawingsforming part of this specification, and in-which,'-

Figure 1 is a side elevation al View of the pump jack, in full linesshowing the parts as seen in one position and in dotted lines showingthe parts of the same in another position; and

Figure 2 is a detail view of the pivotal connection of the pivoted.standard.

Referring to the drawings, itwill be seen the invention contemplates apump jack" adapted to be associated with a pump P of any conventionalcharacter which has as usual a stuffing box S and a polish rod R. Thepump jack as usual imparts a reciprocating movement to the polish rod.

The pump jack includes a suitable base or foundation 10. A transversesill 11 is suitably secured to the base 10 and carries a stationaryframe 12. The stationary frame 12 is provided with anextension in theform of an inclined member 13 secured, as at 14, to the main frame andadjustably secured, as at 15, to a sill 16 arranged upon the base.

A standard 17 is pivotally mounted, as at 18, at its lower end upon thesill 16, so as to befree to partake of a limiteddegree of swingingmotion about the pivot 18. *An arm 19 is pivoted at one end, as at 20,to the upper end of the standard 17 and is adapted 19. rocking frame25"of triangular form fulto be connected at its otherend, as designatedat '21, to the polish rod R. A. link 22 1s plvotally mounted, as at 23,to the outer end of the extension 13 of the stationary frame so that thelink is constrained to mot10n about. a fixed pivot. The outer end of thelink is pivoted, as at 24, to the arm 19 lntermediate the connection 21of the arm to the polish rod and the pivotal connection 20 of the arm tothe upper end of the pivoted standard but nearer to the connection 20.

Means is provided for, actuating the arm This means preferably consistsof a crumed on the main frame, as at 26. A pull rod 27. is provided forrocking the frame 25. A connecting rod '28 has its lower end- Iplvotally secured to the rocking frame 25,.

as at 29, and has its upper end suitably engaged with the arm 19, as at30, sothat motion from the rocking frame is imparted to the arm 19. g

In operation as the pull rod 27 is reciprocated it rocks the frame 25about its pivot 26. The rocking frame 25 through the connecting rod 28imparts motion to the arm 19. On the upward movement of the connectingrod 28 the arm 19 moves upwardly and about its pivot 20. The end of thearm at the connection 21 thereof to the polish rod however partakes ofpure rectilinear.

shown in initial position in full lines and at the end of the upwardstroke in dotted lines. As shown in dotted lines the link 22 haspartaken of its motion about its fixed pivot in a direction opposite tothat of the arm 19 and has displaced the pivoted standard 17sufiiciently to compensate for the pivotal motion of the arm 19 andpermit the outer end thereof to reciprocate rectilinearly. Thisarrangement permits the use of available and inexpensiveinstrumentalities ,ily understood from an inspection of Figure 1 of thedrawings in which the parts are a f Patented May 9,1922.

to impart the correct character and degree of motion to the polish rodso that the life of the polish rod, stufiing boxes and associatedelements is much longer and their efiiciency is reatly increased. avingthus descrlbed my invention, I claim: A

A pump jack comprising a base, a stationary frame arranged upon saidbase and having an extension, a standard pivoted at its lower end tosaid base, an arm pivotally secured at one end to the upper end of saidstandard and adapted to be connected at its other endvvith the polishrod of the pump, a

link having one end pivotally secured to the frame extension and theother end pivotally ing rod transmitting motion from the rocking framedirectly and immediately to the arm. 1 v v v WILLIAM G. JENSEN.

